[Bug tree-optimization/42250] New: segfault in ipa-type-escape.c for several cpu2000 tests

["janis at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

GCC trunk gets a segmentation fault when building SPEC CPU2000 tests 164.gzip,
175.vpr, 176.gcc, 197.parser, 252.eon, 253.perlbmk, and 177.mesa with "-O2
-fipa-type-escape" on powerpc-linux.  That option is meant to be used with
-fipa-struct-reorg, which is meant to be used with -combine and
-fwhole-program, and the same segfault happens with that whole set of options. 
The segfault always happens in the same place, verified by testing with this
patch:

-------------------------------------------------------------------------
Index: gcc/ipa-type-escape.c
===================================================================
--- gcc/ipa-type-escape.c       (revision 154833)
+++ gcc/ipa-type-escape.c       (working copy)
@@ -1663,6 +1663,7 @@ analyze_function (struct cgraph_node *fn
     struct function *this_cfun = DECL_STRUCT_FUNCTION (decl);
     basic_block this_block;

+    gcc_assert (this_cfun != NULL);
     FOR_EACH_BB_FN (this_block, this_cfun)
       {
        gimple_stmt_iterator gsi;
-------------------------------------------------------------------------

The minimized test case is kind of large so I'll attach it.

The failure starts with this patch:

    http://gcc.gnu.org/viewcvs?view=rev&rev=147294

    r147294 | hubicka | 2009-05-08 19:19:51 +0000 (Fri, 08 May 2009)


-- 
           Summary: segfault in ipa-type-escape.c for several cpu2000 tests
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: janis at gcc dot gnu dot org
GCC target triplet: powerpc-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42250